On 2014年11月11日 22:20, Zubair Lutfullah Kakakhel wrote:
Hi Andy,
This patch adds the reg-io-width binding.
Hence the binding patch should come before it.
do you mean that I should put dts binding patch
before this patch?
On 11/11/14 12:53, Andy Yan wrote:
On rockchip rk3288, only word(32-bit) accesses are
permitted for hdmi registers. Byte width accesses (writeb,
readb) generate an imprecise external abort.
Signed-off-by: Andy Yan <andy.yan@xxxxxxxxxxxxxx>
---
}
static void hdmi_modb(struct dw_hdmi *hdmi, u8 data, u8 mask, unsigned reg)
@@ -1499,6 +1527,23 @@ static int dw_hdmi_bind(struct device *dev, struct device *master, void *data)
struct device_node *ddc_node;
struct resource *iores;
int ret, irq;
+ u32 val = 1;
+
+ of_property_read_u32(np, "reg-io-width", &val);
+
+ switch (val) {
+ case 4:
+ hdmi->write = dw_hdmi_writel;
+ hdmi->read = dw_hdmi_readl;
+ break;
+ case 1:
+ hdmi->write = dw_hdmi_writeb;
+ hdmi->read = dw_hdmi_readb;
+ break;
+ default:
+ dev_err(dev, "reg-io-width must be 1 or 4\n");
+ return -EINVAL;
+ }
The binding patch says this is an optional property.
But here if undefined it returns -EINVAL.
I would keep it optional and default it to byte access.
if the dts undefined it, the val will be 1.
if the dts defined other value except 4 and 1, return -EINVAL
Regards,
ZubairLK
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